| 摘要 |
PROBLEM TO BE SOLVED: To provide a method that judges a cause of a reception error in radio packet communication as interference from a surrounding zone or collision of packets. SOLUTION: When a base station receives an erroneous signal and a reception level of the erroneous signal exceeds a 1st threshold level, access of all other terminal equipments than a terminal equipment to which a token is provided is inhibited. When a carrier in excess of a 2nd threshold level is detected in a discrimination timing for a period when the access is inhibited, and when a reception error is produced in a transmission signal from the terminal equipment to which a token is provided and the reception level exceeds a 3rd threshold level, it is discriminated that the cause to the erroneous signal is interference from a surrounding zone. When a carrier in excess of the 2nd threshold level is not detected in the discrimination timing and when a transmission signal of the terminal equipment to which a token is provided is normally received or when a reception error is caused in the transmission signal and the reception level is the 3rd threshold level or below, the cause to the erroneous signal is discriminated to be collation of packets. |
